Inertia

Inertia is a fan-named concept in Devil May Cry 4 caused by the physics of the game.

Gameplay
Inertia occurs when a technique has momentum causes the player character to drift through the air until they reach the ground. This movement allows for greater player control over positioning and can allow certain tecniques, such as Rain Storm, to have an effect over a greater area. Inertia typically requires Jump Cancelling to have an effect and shooting an enemy will cause the character to drift toward it.